66560601651 has 4 divisors (see below), whose sum is σ = 88747468872. Its totient is φ = 44373734432.

The previous prime is 66560601637. The next prime is 66560601671. The reversal of 66560601651 is 15610606566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66560601651 - 2⁹ = 66560601139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66560601671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11093433606 + ... + 11093433611.

It is an arithmetic number, because the mean of its divisors is an integer number (22186867218).

Almost surely, 2^66560601651 is an apocalyptic number.

66560601651 is a deficient number, since it is larger than the sum of its proper divisors (22186867221).

66560601651 is a wasteful number, since it uses less digits than its factorization.

66560601651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22186867220.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 66560601651 in words is "sixty-six billion, five hundred sixty million, six hundred one thousand, six hundred fifty-one".